device syz0 entered promiscuous mode ------------[ cut here ]------------ WARNING: CPU: 1 PID: 3331 at net/core/dev.c:2466 skb_warn_bad_offload+0x2af/0x390 net/core/dev.c:2461 syz0: caps=(0x00000400000058c1, 0x0000000000000000) len=28 data_len=0 gso_size=8 gso_type=5 ip_summed=0 Kernel panic - not syncing: panic_on_warn set ... CPU: 1 PID: 3331 Comm: syzkaller332456 Not tainted 4.9.73-gf3f3457 #1 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 ffff8801c943f370 ffffffff81d922b9 ffffffff83a46d00 ffff8801c943f448 ffffffff83ee1900 ffffffff82f3226f 0000000000000009 ffff8801c943f438 ffffffff8142d741 0000000041b58ab3 ffffffff84189000 ffffffff8142d585 Call Trace: [] __dump_stack lib/dump_stack.c:15 [inline] [] dump_stack+0xc1/0x128 lib/dump_stack.c:51 [] panic+0x1bc/0x3a8 kernel/panic.c:179 [] __warn+0x1c4/0x1e0 kernel/panic.c:542 [] warn_slowpath_fmt+0xc4/0x110 kernel/panic.c:565 [] skb_warn_bad_offload+0x2af/0x390 net/core/dev.c:2461 [] __skb_gso_segment+0x52b/0x670 net/core/dev.c:2767 [] skb_gso_segment include/linux/netdevice.h:4000 [inline] [] validate_xmit_skb+0x44e/0x980 net/core/dev.c:3003 [] validate_xmit_skb_list+0xb7/0x120 net/core/dev.c:3052 [] sch_direct_xmit+0x34a/0x5d0 net/sched/sch_generic.c:177 [] __dev_xmit_skb net/core/dev.c:3133 [inline] [] __dev_queue_xmit+0x15fd/0x1e60 net/core/dev.c:3393 [] ? 0xffffffff810002b8 [] dev_queue_xmit+0x17/0x20 net/core/dev.c:3458 [] packet_snd net/packet/af_packet.c:2953 [inline] [] packet_sendmsg+0x2ccc/0x4760 net/packet/af_packet.c:2978 [] sock_sendmsg_nosec net/socket.c:635 [inline] [] sock_sendmsg+0xca/0x110 net/socket.c:645 [] sock_write_iter+0x226/0x3b0 net/socket.c:843 [] new_sync_write fs/read_write.c:499 [inline] [] __vfs_write+0x4bf/0x680 fs/read_write.c:512 [] vfs_write+0x189/0x530 fs/read_write.c:560 [] SYSC_write fs/read_write.c:607 [inline] [] SyS_write+0xd9/0x1b0 fs/read_write.c:599 [] entry_SYSCALL_64_fastpath+0x23/0xc6 Dumping ftrace buffer: (ftrace buffer empty) Kernel Offset: disabled Rebooting in 86400 seconds..